FOXBOROUGH, Mass. — The Massachusetts State Police served Miami Dolphins center Mike Pouncey with a grand jury subpoena less than an hour after the Patriots defeated the Dolphins 27-17 at Gillette Stadium on Sunday afternoon.

A source with knowledge of the matter told SI.com that the subpoena is related to the investigation into Aaron Hernandez, Pouncey’s close friend and former teammate at the University of Florida. The source indicated that police are focusing in on Hernandez’s potential involvement in interstate gun trafficking, which is being investigated by several agencies in multiple states — at least Massachusetts, New York and Florida.

The extent of Pouncey’s potential involvement is undetermined, but police are focusing on multiple transactions that involve him and Hernandez. “Organizationally, we do not have a comment,” said Dolphins spokesman Harvey Greene. “And Mike Pouncey does not have a comment.”